Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 3)
3.
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
Answer: Option
Explanation:
| A's 2 day's work = |  |
1 | x 2 |  |
= | 1 | . |
| 20 | 10 |
| (A + B + C)'s 1 day's work = | |
1 | + | 1 | + | 1 | |
= | 6 | = | 1 | . |
| 20 | 30 | 60 | 60 | 10 |
| Work done in 3 days = | |
1 | + | 1 | |
= | 1 | . |
| 10 | 10 | 5 |
| Now, | 1 | work is done in 3 days. |
| 5 |
Whole work will be done in (3 x 5) = 15 days.
Discussion:
357 comments Page 21 of 36.
Aishwarya Subhash said:
6 years ago
That is 1/15 work is done in 1 Day.
Now 4/5 part of work that is (1-1/5) will be done in :15*4/5 =12 days.
Now 4/5 part of work that is (1-1/5) will be done in :15*4/5 =12 days.
Nitin.killekar@gmail.com said:
1 decade ago
In the last step the multiplication of 3 and 5 is for the no.of persons (3) and amount of work done (5).
Psyco said:
1 decade ago
1/5th work done in 3 days.
5/5th of work will be done in x days so,
1/5---3.
5/5---x.
x=3*5*5/5.
x=15.
5/5th of work will be done in x days so,
1/5---3.
5/5---x.
x=3*5*5/5.
x=15.
Amit bhau said:
5 years ago
3 days ---> work 1/5
x days ---> to get total work =1
Cross multiplication, then we get x = 15.
x days ---> to get total work =1
Cross multiplication, then we get x = 15.
(1)
Anand J said:
9 years ago
I'm finding difficulty in understanding the question. How to analyze the question? Please help me out.
Madhuri Choudhary said:
1 decade ago
I didn't understood how did they calculated the work done in 3 days. Can somebody explain me clearly?
Niket said:
1 decade ago
Actually in 3rd step work done by A on 3rd day was not added that's why the answer became 15 days.
Sid said:
9 years ago
According to me, the answer is [1/10 + 1/10 + 1/20] = 1/4 for 3 days the whole days is 4 * 3 = 12.
Common man said:
6 years ago
3days = 1/5.
6days = 2/5.
9days = 3/5.
12days = 4/5.
15days = 5/5 = 1 total work done is complete.
6days = 2/5.
9days = 3/5.
12days = 4/5.
15days = 5/5 = 1 total work done is complete.
Nirav said:
1 decade ago
@chaaya:
1/5 work done in no. of days= 3
1 work done in no. of days= ?
so it is 3/(1/5)= 3*5=15
1/5 work done in no. of days= 3
1 work done in no. of days= ?
so it is 3/(1/5)= 3*5=15
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